# How do I rewrite an equation using function rotation?

### Solution:

A function is a type of relation, i.e. it relates one set of numbers to another. The function (call it “f”) takes any member of one set (call it “x”) and connects it to a unique member of another set. Symbolically, we write this unique member of the other set as f(x). You can say “f of x” when you see this rotation.

Now, we can write the function as a rule or equation. For example, **f(x) = 2x**. In this example, each value of x as assigned double its value by the function f.

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